Can piercer



FIG. 1 is a front elevational view of a can piercer showing my new design;

FIG. 2 is a right side elevational view thereof;

FIG. 3 is a rear elevational view thereof;

FIG. 4 is a bottom plan view thereof; and

FIG. 5 is a top plan view thereof.

The left side is a mirror image of the right side. 

The ornamental design for a can piercer, substantially as shown and described. 